Even with this, it was hard to decipher whether or not she expected this or she was surprised. She didn't talk either, maybe she was taking awhile to come up with something to say, this is the first time someone acted this way to her. "...you are quite interesting...a sudden move...maybe I would had more to say if I had the emotions to..." Madeline says, for once sounding like she was stumbling with her words. Just that sudden act from Light happened to make her realize that she had no common knowledge on basic human interactions, including this sudden sign of respect. Madeline is the one half of the vessel that was mainly knowledge, but it seemed like she didnt know completely everything, more importantly, human feelings.